Evidence that auxin promotes gibberellin A<sub>1</sub> biosynthesis in pea

Ross, John J.; O'Neill, Damian; Smith, Jennifer J.; Kerckhoffs, L. H. J.; Elliott, Robert C.

doi:10.1046/j.1365-313x.2000.00702.x

Cited by 234 publications

(197 citation statements)

References 26 publications

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“…Decapitation of pea (Pisum sativum) and tobacco (Nicotiana tabacum) shoot apices reduced the level of active GAs in the stems, and this effect was reversed by auxin application (Ross et al, 2000;Wolbang and Ross, 2001). Auxin was shown to induce the expression of the GA biosynthetic gene GA20ox in tobacco and Arabidopsis, whereas in pea, the hormone induced the expression of GA3ox and suppressed the expression of GA2ox, which is involved in GA deactivation (O'Neill and Ross, 2002;Frigerio et al, 2006).…”

Section: Auxin Interacts Positively With Gamentioning

confidence: 99%

Mechanisms of Cross Talk between Gibberellin and Other Hormones

2007

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Section: Auxin Interacts Positively With Gamentioning

confidence: 99%

Mechanisms of Cross Talk between Gibberellin and Other Hormones

2007

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“…The effect of auxin is one of the clearer examples of plant hormone interactions. It appears to be ancient within the angiosperms, occurring in both monocots (Wolbang et al 2004) and eudicots (Ross et al 2000). One possible scenario is that the capacity of auxin to upregulate the GA genes arose only once, before the divergence of the three ODD groups; for the synthesis genes, this effect has persisted throughout subsequent evolution.…”

Section: Regulation Of Ga Levels By Auxin and By Ga Signallingmentioning

confidence: 99%

Evolution of growth-promoting plant hormones

Ross

Reid

2010

Functional Plant Biol.

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Abstract. The plant growth hormones auxin, gibberellins (GAs) and brassinosteroids (BRs) are major determinants of plant growth and development. Recently, key signalling components for these hormones have been identified in vascular plants and, at least for the GAs and BRs, biosynthetic pathways have been clarified. The genome sequencing of a range of species, including a few non-flowering plants, has allowed insight into the evolution of the hormone systems. It appears that the moss Physcomitrella patens can respond to auxin and contains key elements of the auxin signalling pathway, although there is some doubt as to whether it shows a fully developed rapid auxin response. On the other hand, P. patens does not show a GA response, even though it contains genes for components of GA signalling. The GA response system appears to be more advanced in the lycophyte Selaginella moellendorffii than in P. patens. Signalling systems for BRs probably arose after the evolutionary divergence of the mosses and vascular plants, although detailed information is limited. Certainly, the processes affected by the growth hormones (e.g. GAs) can differ in the different plant groups, and there is evidence that with the evolution of the angiosperms, the hormone systems have become more complex at the gene level. The intermediate nature of mosses in terms of overall hormone biology allows us to speculate about the possible relationship between the evolution of plant growth hormones and the evolution of terrestrial vascular plants in general.

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“…In pea, removal of the apical bud inhibits certain GA-controlled processes in the remaining stem tissue, such as elongation, and the level of GA 1 is also dramatically reduced. The effect of the apical bud can be replaced by applying auxin to the cut stump of the decapitated stem; this procedure restores the endogenous GA 1 level and the elongation (Ross et al, 2000). It is possible that auxin may Figure 6.…”

Section: Possible Fine Tuning Of Xsp30 Expression By Gamentioning

confidence: 99%

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

et al. 2003

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Root-produced organic compounds in xylem sap, such as hormones and amino acids, are known to be important in plant development. Recently, biochemical approaches have revealed the identities of several xylem sap proteins, but the biological functions and the regulation of the production of these proteins are not fully understood. XYLEM SAP PROTEIN 30 kD (XSP30), which is specifically expressed in the roots of cucumber (Cucumis sativus), encodes a lectin and is hypothesized as affecting the development of above-ground organs. In this report, we demonstrate that XSP30 gene expression and the level of XSP30 protein fluctuate in a diurnal rhythm in cucumber roots. The rhythmic gene expression continues for at least two or three cycles, even under continuous light or dark conditions, demonstrating that the expression of this gene is controlled by a circadian clock. Removal of mature leaves or treatment of shoots with uniconazole-P, an inhibitor of gibberellic acid (GA) biosynthesis, dampens the amplitude of the rhythmic expression; the application of GA negates these effects. These results suggest that light signals perceived by above-ground organs, as well as GA that is produced, possibly, in mature leaves, are important for the rhythmic expression of XSP30 in roots. This is the first demonstration of the regulation of the expression of a clock-controlled gene by GA.The higher plant body consists of functionally specialized organs such as the leaf, stem, flower, and root. Because plants grow in changing environments, it is essential for different organs to interact to ensure that the plant body develops and functions properly. Information transfer between organs is essential for synchronized plant development (Bernier, 1988;Kolek and Kozinka, 1991). A major route for the transfer of materials between organs consists of the vascular bundles, which are composed mainly of the xylem and phloem. Numerous materials are translocated over long distances through these bundles. The xylem is composed mainly of xylem vessels, which form a type of apoplastic space. Organic nutrients, such as amino acids, sugars, and organic acids, as well as water and inorganic nutrients, are transported through the xylem to the aboveground organs (Schurr and Schulze, 1995;Zornoza et al., 1996;Satoh et al., 1998). Interestingly, the roots control aspects of the development of aerial organs, possibly acting via growth-related compounds in the xylem sap (Kinet et al., 1993;Satoh, 1996). For example, cytokinin, abscisic acid, and other growth-related compounds that are synthesized in root tissues are involved in stomatal responses (Else et al., 1995;Liang et al., 1997), leaf senescence (Nooden et al., 1990;Soejima et al., 1992), lateral bud development (Bangerth, 1994; Beveridge et al., 1997), flower bud formation (Kinet et al., 1993), leaf greening , and adventitious root formation (Kuroha et al., 2002).Recently, macromolecules have been found in xylem sap, including oligo-and polysaccharides (Satoh et al., 1992; Campbell et al., 1995) and protei...

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Evidence that auxin promotes gibberellin A₁ biosynthesis in pea

Cited by 234 publications

References 26 publications

Mechanisms of Cross Talk between Gibberellin and Other Hormones

Mechanisms of Cross Talk between Gibberellin and Other Hormones

Evolution of growth-promoting plant hormones

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

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Evidence that auxin promotes gibberellin A1 biosynthesis in pea

Cited by 234 publications

References 26 publications

Mechanisms of Cross Talk between Gibberellin and Other Hormones

Mechanisms of Cross Talk between Gibberellin and Other Hormones

Evolution of growth-promoting plant hormones

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

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Evidence that auxin promotes gibberellin A₁ biosynthesis in pea